Heat seal machine



FIG. 1 is a side elevation of a heat seal machine embodying my design;

FIG. 2 is a front view of a heat seal machine embodying my design;

FIG. 3 is a rear view of a heat seal machine embodying my design;

FIG. 4 is a top view of a heat seal machine embodying my design;

FIG. 5 is a bottom view of a heat seal machine embodying my design; and,

FIG. 6 is a perspective view of a heat seal machine embodying my design.

The broken lines in the several figures of the drawings are forillustrative purposes only and form no part of the claimed design.

The ornamental design for a heat seal machine, as shown and described.